Microsoft had not released any sales figures for Windows 8 other than saying the company sold 4 million upgrade licenses of the operating system to those with previous versions of Windows during the first three days it was available. Microsoft launched Windows 8 commercially on October 26.

How does this compare to Windows 7 sales? Microsoft said it had sold 60 million Windows 7 licenses from October 2009 to the end of December 2010

Reller did not release any sales figures for Microsoft's Surface RT tablet/PC devices, which also have been on sale since October 26. She did reiterate that Microsoft will have the Surface Pro, the version of the Surface running Windows 8 Pro, avaialble in January 2013.

Reller spent much of the first 25 minutes of her presentation about Windows 8 and Surface reiterating Microsoft's design philosophy. She cited a number of statistics meant to show that users were positive about the Windows 8 PCs and tablets that have are in the market and coming to market in the coming months.

Reller was asked about Sinofsky's departure during the Q&A part of her presentation. She emphasized that the foundation of Windows is in great shape and that the Windows unit has a deep bench. She said she'd personally miss working with Sinofsky in the future.

Reller shared a few other stats during her remarks including:

Microsoft now has certified 1,500 PCs and tablets for Windows 8, up from the 1,000 devices it had certified a month ago at launch

A number of applications available in the Windows Store have crossed the $25,000 revenue mark. (Again, no specifics were shared here.)

Without acknowledging directly the critics -- including yours truly -- who've found Windows 8 less than intuitive, Reller said that users are finding Windows 8 "easy to understand and embrace." She said users are exploring Windows 8 and enjoying learning it, from Day 1.

Based on customer feedback and information gathered by Microsoft's customer support organization, "We do know that customers do, indeed, 'get' the product," she said.

She said that over 90 percent of those purchasing Windows 8 and Windows RT devices are using the Charms on Day one. (Charms are the icons that provide search, sharing and other basic functions that can be found by swiping in from the right on a Windows 8/Windows RT device.) She said they are using search between two to three times a day every time they are on their devices. And she played up Microsoft's data that found more than half of the users are using the Windows Store on their first day.